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Experimental Study of Fiber-Reinforced Sand Subject to Seepage

机译:纤维增强砂土渗透试验研究

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This paper presents an experimental study on the hydraulic responses of fiber-reinforced soil (FRS) subject to seepage. A series of upward seepage tests on unreinforced and reinforced sand was conducted to investigate the influence of soil density and fiber parameters (i.e., fiber contents and lengths) on the piping failure mode, hydraulic conductivity k, and critical hydraulic gradient i_(cr) of FRS. Direct shear tests were also performed to establish the relationships between soil shear strength and critical hydraulic gradient of FRS. The seepage test results revealed that k decreases and i_(cr) increases as the fiber content increases. Short fiber appears to reduce k; however, the fiber length has only a minor influence on the i_(cr). The fiber has a greater effect on dense specimens than it does on loose specimens. The test results also indicate the i_(cr) of FRS is strongly correlated to its soil shear strength. The findings in this study suggest that the use of FRS as backfill in hydraulic structures can effectively delay the advance of seepage, reduce soil piping potential, and improve system stability against seepage. The results and discussion in this study provide insightful information for the application of FRS to hydraulic structures.
机译:本文提出了对纤维增强土壤(FRS)的水力响应进行渗流的实验研究。对非增强砂和增强砂进行了一系列的向上渗透试验,以研究土壤密度和纤维参数(即纤维含量和长度)对管道破坏模式,导水系数k和临界水力梯度i_(cr)的影响。 FRS。还进行了直接剪切试验,以建立FRS的土壤剪切强度与临界水力梯度之间的关系。渗透测试结果表明,随着纤维含量的增加,k减小,i_(cr)增大。短纤维似乎减少了k;但是,光纤长度对i_(cr)的影响很小。纤维对致密样品的影响要大于对松散样品的影响。试验结果还表明,FRS的i_(cr)与土壤抗剪强度密切相关。这项研究的发现表明,在水工建筑物中使用FRS作为回填可以有效地延迟渗流的进行,减少土壤管道的潜力并提高系统的抗渗漏稳定性。本研究的结果和讨论为FRS在水工结构中的应用提供了有见地的信息。

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